To obtain the metal chemically pure a specially prepared pure oxide or salt of zinc is distilled.
Chemically related to vanadium are the two elements tantalum and columbium or niobium.
Metals may unite chemically both with metals and with non-metals.
Jacob Joseph Winterl, in 1788, appears to have been the first to examine petroleum chemically, but the earliest systematic investigation was that carried out by Professor B.
Specimens of the best known and of many of the lesser known rubbers are included in the Colonial and Indian Collections and Sample Rooms of the Imperial Institute, and many of the authentic specimens have been chemically and technically examined in the Scientific and Technical Department of the Institute and commercially valued.